Wiseco 3910HF Plasma Moly Piston Ring Set 3.910 in. Bore

The Wiseco 3910HF is a replacement plasma moly piston ring set sized for a 3.910-inch bore, sold as a single-piston set. Wiseco offers multiple ring lines to match different piston families, ensuring proper sealing, compression retention, and oil control for both street and performance applications.

Key Features:

• Plasma moly pre-gapped ring set — included with the Wiseco Pro Tru piston line, designed for budget-conscious builders without sacrificing quality
• NPR XX ring sets — featured in Wiseco Sport Compact kits, utilizing premium steel nitrided top rings and Napier-style second rings for superior sealing
• 1.2mm Steel Nitride and Napier GFX ring sets — used in late-model EFI pistons and select small block Chevy applications for tight tolerances and reduced blow-by
• Back-cut top ring (.043) — used on many big block applications, providing additional material thickness around the intake valve area
• Rings are sold per piston — order the quantity needed for your complete engine build

Wiseco piston ring sets are manufactured to exacting specifications to deliver consistent performance and long service life. Always verify ring compatibility with your specific Wiseco piston part number before ordering.